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Numerical Simulation of Entrainment Ratio of Steam Ejector with Petaliform Nozzle(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2012年01期
Page:
29-32
Research Field:
Publishing date:

Info

Title:
Numerical Simulation of Entrainment Ratio of Steam Ejector with Petaliform Nozzle
Author(s):
Zhang Yi; Chen Dandan; Shi Song
School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210042,China
Keywords:
steam ejector; entrainment ratio; petaliform nozzle; numerical simulation
PACS:
V233
DOI:
-
Abstract:
Steam ejector with petaliform nozzle can provide flare gas burner with air． Entrainment ratio is the most important operating parameter of the ejector． Compressible fluid conservation equations of momentum，energy and species are used to compute flow process in the ejector． It is found that the ejector achieves a maximum entrainment ratio when it operates at an optimal primary steam flow． Shock wave appears at exit of petaliform nozzle when steam flow is too large，which leads to the decrease of the entrainment ratio． When the nozzle exit position ( NXP) is located in mixture room，the ejector gains a greater entrainment ratio than out of mixture room． The farther NXP from mixture room is，the less the entrainment ratio is． When a converging － diverging tube is connected to the mixture room，the entrainment ratio is as 1． 5 times large as that connected to a straight tube． The results can be useful for the choice of the operating parameters and design of steam ejector with petaliform nozzle．

References:

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Last Update: 2013-03-11